Metal Hybrid PPTC device offers smart activation feature
February 28, 2012 // Paul Buckley
TE Circuit Protection, a business unit of TE Connectivity, has introduced a Metal Hybrid PPTC (MHP) device offering Smart Activation (SA) functionality. The MHP-SA device provides a resettable, cost-effective and space-saving alternative to typical methods of protecting high-power lithium battery and module applications.
The applications include cordless power tools, e-scooters and light electric vehicles (LEVs) and standby power and energy storage systems (ESSs).
The MHP-SA device helps provide overcharge protection in large multi-cell battery packs and modules in which circuit protection devices interface with electronics as part of a sophisticated battery management system. It's Smart Activation design feature accomplishes this via a third terminal signal line that enables external activation.
In a typical scenario, an IC monitors the battery system's temperature, current and voltage and, if an abnormality is detected, it switches on a FET and activates the heater element (PPTC) of the MHP-SA device to heat the bimetal. The bimetal contacts then open and cut contact to the main line. The first in a series of planned devices, the MHP-SA50-400-M5 device has a 50-A/400-VDC maximum rating and its hold current is 50 A on the main line. The device can be activated electronically with as little as 3 A via the signal line.
MHP technology utilizes a hybrid circuit protection approach, combining a bimetal protector in parallel with a polymeric positive temperature coefficient (PPTC) device. Resettable MHP technology offers excellent arc suppression characteristics and also offers a smaller size and thinner form factor compared to larger DC fuses or other protection devices.
The MHP-SA device helps save design costs due to its ability to employ a low-power switch to open the main line, enabling lower-cost FETs to be installed. And because the MHP-SA device is resettable there is no need to overrate for inrush currents. In some cases, designers can replace larger, higher-cost DC fuses with an MHP-SA device.
“Few protection solutions address high-rate-discharge battery applications, and traditional circuit protection techniques tend to be large, complex and/or expensive,” said Ty Bowman, TE Circuit Protection Global Battery Market Manager. “The MHP-SA device offers design benefits in multi-cell battery packs that conventional circuit protection approaches are unable to deliver. The MHP-SA device provides a rugged, resettable overcharge protection solution that offers battery pack designers and manufacturers a way to optimize space, reduce cost, enhance safety and help meet future battery safety requirements.”
Essess completes Street View with IR heat maps
January 23, 2015
Back in 2011, Professor Sanjay Sarma from the Mechanical Engineering Department at MIT and Co-Founder of US startup Essess, ...
Technology available, application wanted
Open source to flood IT in 2015
Asia leads automotive innovation
Samsung, Apple dominated chip buying in 2014
French startup expands 3D to the room
January 22, 2015
With still 26 days to go, Kickstarter project Immersis from French startup Catopsys has almost reached its funding goal of ...
Fraunhofer develops MEMS optical grating for medium infrared
ARM strengthens position in safety-critical applications
Antireflective nanotextures create self-assembly surface for solar cells
- Sensing Elements for Current Measurements
- Investigating Die attach Failure in IGBTs using Power Cycling Tests
- Power Semiconductor Failure Diagnosis using Thermal Characterization and Power Cycling
- Top 5 Trends in Product Development and Test Engineering
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.